Upon further research, I found that there is an optional "Set Control
Line State" request that does exactly what I want. It is not yet
implemented in cdc.h.
I am going to implement it myself unless someone has done it already?
Thanks
Matthew
On 2015-11-08 11:31 PM, Matthew Lai wrote:
> Hello!
>
> I am using CDC ACM as a debug logging interface, so sometimes there is a
> USB cable connected, and sometimes there isn't.
>
> My send routine looks like this -
>
> int ret = 0;
>
> do
> {
> ret = usbd_ep_write_packet(usbd_dev, 0x82, data, size);
> }
> while (ret == 0);
>
> However, if I call this function when either the USB cable isn't plugged
> in or serial monitor is not opened on the computer, usbd_ep_write_packet
> will just keep returning 0.
>
> Is there a way around this? Is there a way to tell whether the function
> returned zero because there is no receiver, or if it returned zero
> because it's busy and we should retry? Detecting whether the cable is
> plugged in (or even whether the device is enumerated) is insufficient.
>
> Thanks!
> Matthew
>
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Presto, an open source distributed SQL query engine for big data, initially
developed by Facebook, enables you to easily query your data on Hadoop in a
more interactive manner. Teradata is also now providing full enterprise
support for Presto. Download a free open source copy now.
http://pubads.g.doubleclick.net/gampad/clk?id=250295911&iu=/4140
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